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Well, the first step would be to open the hood and check the battery. If it smells, you should be able to trace it down, or at least be able to tell if it is the battery, or something else that smells. If you had something installed, it's possible they left a cable hanging in such a way that it came into contact with the exhasut, or maybe just didn't bolt the battery cable up tight and it is getting poor contact and not charging correctly.